/Engine/Source/Runtime/Experimental/Chaos/Public/Chaos/Evolution/SolverBody.h
theX(),P(),R(),Q()accessors onFSolverBodyreturn the Center of Mass positions and rotations, in contrast to the Particle methods which gives Actor positions and rotations. This is because the Constraint Solvers all calculate impulses and position corrections relative to the center of mass.
class FSolverBody